Speaker
Description
The leakage of CO2 from Portland cement has recently attracted significant research interest, particularly in the context of geologic carbon capture and sequestration. Portland cement is considered susceptible to degradation in the presence of CO2 due to the reaction between the wellbore cement sheath, formation water, and CO2. In the last decade, several studies on wellbore cementing have focused primarily on the strength-enhancing capacity of Nanosilica, despite its potential to address other wellbore cementing issues. The approach employed in this study is predicated on the pre-defined operational mechanism of CO2-induced cement degradation to develop a more resistant Portland cement sheath. The study explores chemical and mechanical analysis sets geared towards efficient and effective performance characterisation. Two sets of samples were prepared for the uncarbonated and carbonated batches. The slurries were prepared with 0%, 1.0%, and 1.5% Nanosilica by weight of cement, free of conventional additives, for representative characterisation. X-ray Diffraction, Thermogravimetry, and mechanical and petrophysical analysis show that the addition of Nanosilica enhanced the cement sheath's chemical resistance, mechanical strength and petrophysical properties. The addition of 1% nanosilica demonstrated consistent, optimal performance across all evaluation parameters. The study outcome provides a holistic effect characterisation and determination of the working mechanism of Nanosilica in cement sheath as well as its proficiency in new functionalities in the presence of CO2, and thus, contributes to the future advancement of performance and mechanism-based hybrid composite development suitable for a variety of subsurface conditions as well as Geologic carbon capture and sequestration.
| Country | United Kingdom |
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